The Polish steam tug type B 61 according to a CIA report dated around 1955

In a report titled Shipbuilding in Poland 1945-1955 were several series of ships described built by Polish shipyards including the steam tug type B61 with a horsepower of 800ihp/130rpm, a service speed of 10 knots and as dimensions 42,60  (between perpendiculars)-47,40 (overall) x 9,70 (moulded) d 4,70 (depth to main deck) x 4,12 (draught) aft metres or 139’9”-155’6”x 31’10”x 15’5”x 13’6”.

Source
The report was published on www.archive.org, document number CIA-RDP80T00246A003600560002-9